Hello fellow Linux gamers.
I'm experiencing this weird glitch in Deus Ex: MD when screen is gradually filling with black pixels. It is only related to 3D rendering since HUD and menu renders fine.
I had Mesa Padoka Stable installed at the time (18.2.4). I have replaced it with default version (18.0.5) and now it works fine. Also, I'm getting about 20 FPS more now with Mesa 18.0.5.